Drop Down List Text Change

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Hi,

I have wrote this code to load when drop down list index change, but it doesn't working in index change event and other text change event, but working in button click event. Please advise what is the wrong?

SqlConnection con = new SqlConnection(connection);
SqlCommand cmd1 = new SqlCommand("Select ID from Test where Name='" + DropDownList1.Text + "'", con);

SqlDataAdapter da1 = new SqlDataAdapter(cmd1);

DataSet ds1 = new DataSet();
da1.Fill(ds1);

DropDownList2.DataTextField = ds1.Tables[0].Columns["ID"].ToString();
DropDownList2.DataValueField = ds1.Tables[0].Columns["ID"].ToString();

DropDownList2.DataSource = ds1.Tables[0];
DropDownList2.DataBind();

Posted 26-Aug-13 2:00am

abdulsafran

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ZurdoDev 26-Aug-13 8:06am

How could we know? What does it mean that it isn't working? You didn't even post the code that isn't working.

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CodeBlack · Accepted Answer · 2013-08-26T02:08:00

Solution 1

Set the AutoPostBack="True" in your dropdown list control.

Posted 26-Aug-13 2:08am

CodeBlack

Comments

abdulsafran 26-Aug-13 8:33am

Thanks for the answer, now DropDownList2 text values are changing, but I got another problem, the problem is I have created page load event to load one column to DropDownList1, therefore values are changing from only first value in DropDownList1. I can select the second value, because it's always get as first value in DropDownList1. Please advise.

CodeBlack 26-Aug-13 8:46am

can you post your page load event ?

abdulsafran 26-Aug-13 8:57am

SqlConnection con = new SqlConnection(connection");
SqlCommand cmd1 = new SqlCommand("Select Name from Test", con);

SqlDataAdapter da1 = new SqlDataAdapter(cmd1);

DataSet ds1 = new DataSet();
da1.Fill(ds1);

DropDownList1.DataTextField = ds1.Tables[0].Columns["Name"].ToString();
DropDownList1.DataValueField = ds1.Tables[0].Columns["Name"].ToString();

DropDownList1.DataSource = ds1.Tables[0];
DropDownList1.DataBind();

CodeBlack 26-Aug-13 9:00am

Update your code as mentioned below :

SqlConnection con = new SqlConnection(connection");

SqlCommand cmd1 = new SqlCommand("Select Name from Test", con);

SqlDataAdapter da1 = new SqlDataAdapter(cmd1);

if(!IsPostBack)
{
DataSet ds1 = new DataSet();

da1.Fill(ds1);

DropDownList1.DataTextField = ds1.Tables[0].Columns["Name"].ToString();

DropDownList1.DataValueField = ds1.Tables[0].Columns["Name"].ToString();

DropDownList1.DataSource = ds1.Tables[0];

DropDownList1.DataBind();
}

Dont forget to mark it as an answer and rate this solution.

abdulsafran 26-Aug-13 9:06am

Thank you very much for your answer. I have rated you. Can I ask my last question?

CodeBlack 26-Aug-13 9:06am

yes

abdulsafran 26-Aug-13 9:11am

I have put a grid view in design, once I add below code to button click event. Grid view is not display. Can you help me?

SqlConnection con = new SqlConnection(connection);
DataTable dt = new DataTable();
SqlDataAdapter sda = new SqlDataAdapter("select * from Test", con);
sda.Fill(dt);
GridView1.DataSource = dt;

CodeBlack 26-Aug-13 9:12am

after
GridView1.DataSource = dt;
put
GridView1.DataBind();

abdulsafran 26-Aug-13 9:17am

Thanks a lot for your answers. God bless you!

CodeBlack 26-Aug-13 9:18am

welcome :)