cant find value in gridview

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taking the value from dropdownlist and showing in gridview.with this code when i press button nothing happen and no error come.please help me out with that

C#

string a = DropDownList1.SelectedValue.ToString();
SqlConnection con = new SqlConnection(connstring);
string query="SELECT * FROM ['ISB VAS Nodes$'] WHERE Model='"+DropDownList1.Text+"'";
SqlDataAdapter da = new SqlDataAdapter(query, con);
DataTable dt = new DataTable();
da.Fill(dt);
GridView1.DataSource = dt;
GridView1.DataBind();

Posted 21-Apr-13 18:51pm

fak_farrukh

Updated 21-Apr-13 20:10pm

_Amy

v2

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PrashantSonewane 22-Apr-13 0:56am

First of all correct the code at string query="SELECT * FROM ['ISB VAS Nodes$'] WHERE Model='"+DropDownList1.Text+"'"; as string query="SELECT * FROM ['ISB VAS Nodes$'] WHERE Model='"+ a +"'"; a is variable where you collect the dropdown value. Let us know if that is also not working.

fak_farrukh 22-Apr-13 1:03am

i have change but same issue

Mojtaba Eng 22-Apr-13 1:05am

hi:
check filled DataTable Rows Count : MessageBox.Show(dt.Rows.Count.ToString());
if it nonzero , go for datagrid if have problem yet.

fak_farrukh 22-Apr-13 1:09am

can't understand

Chinmaya C 22-Apr-13 1:07am

Where you have written the above code. Can you please post the eventsource of the mentioned code.

Mojtaba Eng 22-Apr-13 1:08am

aftet fill :d
a.Fill(dt);
Response.Write(dt.Rows.Count.ToString());//for asp.net

Thanks7872 22-Apr-13 1:18am

In this type of case,you should post your code with gridview getting data as well,cz here its also important to know weather your gridview getting filled with required data or not..

fak_farrukh 22-Apr-13 1:20am

noo again same result

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rmksiva · Answer 1 · 2013-04-21T20:08:00

Hi,

Only Possible way is check Data table row count

string a = DropDownList1.SelectedValue.ToString();
SqlConnection con = new SqlConnection(connstring);
string query="SELECT * FROM ['ISB VAS Nodes$'] WHERE Model='"+DropDownList1.Text+"'";
SqlDataAdapter da = new SqlDataAdapter(query, con);
DataTable dt = new DataTable();

da.Fill(dt);

if(dt.rows.Count>0)
{
 GridView1.DataSource = dt;
 GridView1.DataBind();
}
else
{
 lblResult.Text = "No Records Found";
}

And You may Add below code to gridview design for display Empty message

<emptydatatemplate>
No Records Found
</emptydatatemplate>

When execute this, If you Got this message - that Means DB Table does not Contain Records, that match to your query

Thanks

Siva Rm K