fetch specific column from sql database and saving value in variable in asp.net c#

Hi all i am trying to get data of a specific column from my database and then use that data to subtract.. but i am getting an error that input string is not in a correct format.

I have tried almost every thing that i know but nothing is working can any one help me??

my code -

    string t_qty = "";



    SqlCommand cmd1 = new SqlCommand("select QTY from STOCK_ARRIVE where BARCODE = @barcode", d.con);

     cmd1.Parameters.AddWithValue("@barcode", txt_barcode.Text);

    d.con.Open();

    SqlDataReader dr = cmd1.ExecuteReader();





    while (dr.Read())

    {

        t_qty = dr["QTY"].ToString();



    }





        d.con.Close();



        try

        {



            int less = 0;

            less = int.Parse(t_qty) - int.Parse(txt_qty.Text);



            SqlCommand cmd2 = new SqlCommand("update STOCK_ARRIVE set QTY=@pq where BARCODE=@barcode AND S_VC=@vc", d.con);

            cmd2.Parameters.AddWithValue("@pq", less);



            cmd2.Parameters.AddWithValue("@barcode", txt_barcode.Text);

            cmd2.Parameters.AddWithValue("@vc", txt_vc.Text);

            d.con.Open();

            cmd2.ExecuteNonQuery();

            d.con.Close();



        }

        catch (Exception ex)

        {

            Response.Write(ex);

        }





        Response.Write("<script>alert('Data has been saved')</script>");

edited Nov 15 '18 at 9:38

sidprasher

2,42211530

asked Nov 15 '18 at 9:09

Hamza Dati

Please check both t_qty and txt_qty.Text, probably there's something which is not convertible to integer.
– Tetsuya Yamamoto
Nov 15 '18 at 9:13

What is the data type of the column QTY in the database Is it int? Why are you using a string to store it? Also what is the data type for STOCK_ARRIVE ?
– sidprasher
Nov 15 '18 at 9:27

STOCK_ARRIVE is the name of table from which QTY is coming and yes datatype of QTY is int in database.
– Hamza Dati
Nov 15 '18 at 9:59

add a comment |

Hi all i am trying to get data of a specific column from my database and then use that data to subtract.. but i am getting an error that input string is not in a correct format.

I have tried almost every thing that i know but nothing is working can any one help me??

my code -

    string t_qty = "";



    SqlCommand cmd1 = new SqlCommand("select QTY from STOCK_ARRIVE where BARCODE = @barcode", d.con);

     cmd1.Parameters.AddWithValue("@barcode", txt_barcode.Text);

    d.con.Open();

    SqlDataReader dr = cmd1.ExecuteReader();





    while (dr.Read())

    {

        t_qty = dr["QTY"].ToString();



    }





        d.con.Close();



        try

        {



            int less = 0;

            less = int.Parse(t_qty) - int.Parse(txt_qty.Text);



            SqlCommand cmd2 = new SqlCommand("update STOCK_ARRIVE set QTY=@pq where BARCODE=@barcode AND S_VC=@vc", d.con);

            cmd2.Parameters.AddWithValue("@pq", less);



            cmd2.Parameters.AddWithValue("@barcode", txt_barcode.Text);

            cmd2.Parameters.AddWithValue("@vc", txt_vc.Text);

            d.con.Open();

            cmd2.ExecuteNonQuery();

            d.con.Close();



        }

        catch (Exception ex)

        {

            Response.Write(ex);

        }





        Response.Write("<script>alert('Data has been saved')</script>");

edited Nov 15 '18 at 9:38

sidprasher

2,42211530

asked Nov 15 '18 at 9:09

Hamza Dati

Please check both t_qty and txt_qty.Text, probably there's something which is not convertible to integer.
– Tetsuya Yamamoto
Nov 15 '18 at 9:13

What is the data type of the column QTY in the database Is it int? Why are you using a string to store it? Also what is the data type for STOCK_ARRIVE ?
– sidprasher
Nov 15 '18 at 9:27

STOCK_ARRIVE is the name of table from which QTY is coming and yes datatype of QTY is int in database.
– Hamza Dati
Nov 15 '18 at 9:59

add a comment |

Hi all i am trying to get data of a specific column from my database and then use that data to subtract.. but i am getting an error that input string is not in a correct format.

I have tried almost every thing that i know but nothing is working can any one help me??

my code -

    string t_qty = "";



    SqlCommand cmd1 = new SqlCommand("select QTY from STOCK_ARRIVE where BARCODE = @barcode", d.con);

     cmd1.Parameters.AddWithValue("@barcode", txt_barcode.Text);

    d.con.Open();

    SqlDataReader dr = cmd1.ExecuteReader();





    while (dr.Read())

    {

        t_qty = dr["QTY"].ToString();



    }





        d.con.Close();



        try

        {



            int less = 0;

            less = int.Parse(t_qty) - int.Parse(txt_qty.Text);



            SqlCommand cmd2 = new SqlCommand("update STOCK_ARRIVE set QTY=@pq where BARCODE=@barcode AND S_VC=@vc", d.con);

            cmd2.Parameters.AddWithValue("@pq", less);



            cmd2.Parameters.AddWithValue("@barcode", txt_barcode.Text);

            cmd2.Parameters.AddWithValue("@vc", txt_vc.Text);

            d.con.Open();

            cmd2.ExecuteNonQuery();

            d.con.Close();



        }

        catch (Exception ex)

        {

            Response.Write(ex);

        }





        Response.Write("<script>alert('Data has been saved')</script>");

edited Nov 15 '18 at 9:38

sidprasher

2,42211530

asked Nov 15 '18 at 9:09

Hamza Dati

Hi all i am trying to get data of a specific column from my database and then use that data to subtract.. but i am getting an error that input string is not in a correct format.

I have tried almost every thing that i know but nothing is working can any one help me??

my code -

    string t_qty = "";



    SqlCommand cmd1 = new SqlCommand("select QTY from STOCK_ARRIVE where BARCODE = @barcode", d.con);

     cmd1.Parameters.AddWithValue("@barcode", txt_barcode.Text);

    d.con.Open();

    SqlDataReader dr = cmd1.ExecuteReader();





    while (dr.Read())

    {

        t_qty = dr["QTY"].ToString();



    }





        d.con.Close();



        try

        {



            int less = 0;

            less = int.Parse(t_qty) - int.Parse(txt_qty.Text);



            SqlCommand cmd2 = new SqlCommand("update STOCK_ARRIVE set QTY=@pq where BARCODE=@barcode AND S_VC=@vc", d.con);

            cmd2.Parameters.AddWithValue("@pq", less);



            cmd2.Parameters.AddWithValue("@barcode", txt_barcode.Text);

            cmd2.Parameters.AddWithValue("@vc", txt_vc.Text);

            d.con.Open();

            cmd2.ExecuteNonQuery();

            d.con.Close();



        }

        catch (Exception ex)

        {

            Response.Write(ex);

        }





        Response.Write("<script>alert('Data has been saved')</script>");

c# asp.net sql-server

edited Nov 15 '18 at 9:38

sidprasher

2,42211530

asked Nov 15 '18 at 9:09

Hamza Dati

edited Nov 15 '18 at 9:38

sidprasher

2,42211530

asked Nov 15 '18 at 9:09

Hamza Dati

edited Nov 15 '18 at 9:38

sidprasher

2,42211530

edited Nov 15 '18 at 9:38

sidprasher

2,42211530

edited Nov 15 '18 at 9:38

sidprasher

2,42211530

asked Nov 15 '18 at 9:09

Hamza Dati

asked Nov 15 '18 at 9:09

Hamza Dati

asked Nov 15 '18 at 9:09

Hamza Dati

Please check both t_qty and txt_qty.Text, probably there's something which is not convertible to integer.
– Tetsuya Yamamoto
Nov 15 '18 at 9:13

What is the data type of the column QTY in the database Is it int? Why are you using a string to store it? Also what is the data type for STOCK_ARRIVE ?
– sidprasher
Nov 15 '18 at 9:27

STOCK_ARRIVE is the name of table from which QTY is coming and yes datatype of QTY is int in database.
– Hamza Dati
Nov 15 '18 at 9:59

add a comment |

Please check both t_qty and txt_qty.Text, probably there's something which is not convertible to integer.
– Tetsuya Yamamoto
Nov 15 '18 at 9:13

What is the data type of the column QTY in the database Is it int? Why are you using a string to store it? Also what is the data type for STOCK_ARRIVE ?
– sidprasher
Nov 15 '18 at 9:27

STOCK_ARRIVE is the name of table from which QTY is coming and yes datatype of QTY is int in database.
– Hamza Dati
Nov 15 '18 at 9:59

Please check both t_qty and txt_qty.Text, probably there's something which is not convertible to integer.
– Tetsuya Yamamoto
Nov 15 '18 at 9:13

What is the data type of the column QTY in the database Is it int? Why are you using a string to store it? Also what is the data type for STOCK_ARRIVE ?
– sidprasher
Nov 15 '18 at 9:27

STOCK_ARRIVE is the name of table from which QTY is coming and yes datatype of QTY is int in database.
– Hamza Dati
Nov 15 '18 at 9:59

add a comment |

1 Answer
1

active

oldest

votes

Most probably your cnversion int.Parse(t_qty) is failing. Instead try using TryParse() like

int.TryParse(t_qty, out int quanrtity)

answered Nov 15 '18 at 9:18

Rahul

62k124481

@barcode is not getting the value from txt_barcode.text.
– Hamza Dati
Nov 15 '18 at 10:04

add a comment |

Your Answer

StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});

}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53315850%2ffetch-specific-column-from-sql-database-and-saving-value-in-variable-in-asp-net%23new-answer', 'question_page');
}
);

Post as a guest

Name

Required, but never shown

1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

Most probably your cnversion int.Parse(t_qty) is failing. Instead try using TryParse() like

int.TryParse(t_qty, out int quanrtity)

answered Nov 15 '18 at 9:18

Rahul

62k124481

@barcode is not getting the value from txt_barcode.text.
– Hamza Dati
Nov 15 '18 at 10:04

add a comment |

Most probably your cnversion int.Parse(t_qty) is failing. Instead try using TryParse() like

int.TryParse(t_qty, out int quanrtity)

answered Nov 15 '18 at 9:18

Rahul

62k124481

@barcode is not getting the value from txt_barcode.text.
– Hamza Dati
Nov 15 '18 at 10:04

add a comment |

Most probably your cnversion int.Parse(t_qty) is failing. Instead try using TryParse() like

int.TryParse(t_qty, out int quanrtity)

answered Nov 15 '18 at 9:18

Rahul

62k124481

Most probably your cnversion int.Parse(t_qty) is failing. Instead try using TryParse() like

int.TryParse(t_qty, out int quanrtity)

answered Nov 15 '18 at 9:18

Rahul

62k124481

answered Nov 15 '18 at 9:18

Rahul

62k124481

answered Nov 15 '18 at 9:18

Rahul

62k124481

answered Nov 15 '18 at 9:18

Rahul

62k124481

@barcode is not getting the value from txt_barcode.text.
– Hamza Dati
Nov 15 '18 at 10:04

add a comment |

@barcode is not getting the value from txt_barcode.text.
– Hamza Dati
Nov 15 '18 at 10:04

@barcode is not getting the value from txt_barcode.text.
– Hamza Dati
Nov 15 '18 at 10:04

add a comment |

draft saved

draft discarded

Thanks for contributing an answer to Stack Overflow!

Please be sure to answer the question. Provide details and share your research!

But avoid …

Asking for help, clarification, or responding to other answers.

Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

Some of your past answers have not been well-received, and you're in danger of being blocked from answering.

Please pay close attention to the following guidance:

Please be sure to answer the question. Provide details and share your research!

But avoid …

Asking for help, clarification, or responding to other answers.

Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Name

Required, but never shown

Name

Required, but never shown

This page is only for reference, If you need detailed information, please check here

搜尋此網誌

Agfdhyk