How to find id using hiddenfield in gridview on button click

Himanshu Tyagi

My update button is outside gridview

I am trying but its showing error "Object reference not set to an instance of an object." on "string strhfId = (gvRow.FindControl("hfId") as HiddenField).Value;"

I have tried different too

HiddenField hfId = (HiddenField)gridData.SelectedRow.Cells[0].FindControl("hfId");

but error is same

protected void lnkUpdate_Click(object sender, EventArgs e)

{

//HiddenField hfId = (HiddenField)gridData.SelectedRow.Cells[0].FindControl("hfId"); // Error is here

//HiddenField strId = ((HiddenField)gridData.Rows[0].FindControl("hfIdValue"));

//String value = strId.Value;

LinkButton btn = sender as LinkButton;

GridViewRow gvRow = btn.NamingContainer as GridViewRow;

string strhfId = (gvRow.FindControl("hfId") as HiddenField).Value; // Error is here

try

{

//HiddenField hfIdc = (HiddenField)gridData.SelectedRow.Cells[0].FindControl("hfIdValue");

List parameters = new List

{

};

parameters.Add(new SqlParameter("@P_APPLICATION_ID", strhfId));

parameters.Add(new SqlParameter("@P_APPLICATION_NAME", txtApplicationName.Text));

parameters.Add(new SqlParameter("@P_MODE", "E"));

string strResponse = objAppFunctionModule.ExecuteNonQueryMethod(strUSP_APPLICATION_MST, parameters);

PopulateGrid();

}

catch (Exception ex)

{

lblResponse.Text = ex.Message;

}

7 Replies

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Himanshu Tyagi8y ago
Yes Ramesh u r ryt,
i had used this line also
"HiddenField hdfValue = (HiddenField)gridData.Rows[0].FindControl("hfId");"
but here is one prob - if there is multiple record and m going to edit any one of them then its containing first id
Himanshu Tyagi8y ago
RowStyle-HorizontalAlign="Center" ShowHeaderWhenEmpty="true" OnRowCommand="gridData_RowCommand"
EmptyDataText="No Data for the Selected Value" BackColor="White" BorderColor="#c5c5c5" BorderWidth="1px" Width="100%"
CellPadding="4" AllowPaging="True">

Edit
Ramesh Palanivel8y ago
Hi Himanush,

Please correct me if I am wrong,

You are selecting any one of row in your datagridview and clicking update button to update the record?

Id value is hidden column, Am I right?
Himanshu Tyagi8y ago
protected void lnkUpdate_Click(object sender, EventArgs e)

{

HiddenField hfId = (HiddenField)gridData.SelectedRow.Cells[0].FindControl("hfId"); //Error on this line "Object reference not set to an instance of an object."

try

{

List parameters = new List

{

};

parameters.Add(new SqlParameter("@P_APPLICATION_ID", hfId.Value));

parameters.Add(new SqlParameter("@P_APPLICATION_NAME", txtApplicationName.Text));

parameters.Add(new SqlParameter("@P_VERSION", txtAppVersion.Text));

parameters.Add(new SqlParameter("@P_DESCRIPTION", txtDesc.Text));

parameters.Add(new SqlParameter("@P_USER", lblName.Text));

parameters.Add(new SqlParameter("@P_MODE", "E"));strResponse = objAppFunctionModule.ExecuteNonQueryMethod(strUSP_APPLICATION_MST, parameters);

if (strResponse == "1")

{

divMessage.Visible = true;

divDelete.Visible = false;

lnkSave.Visible = true;

lnkAddNew.Visible = false;

lnkUpdate.Visible = false;

PopulateGrid();

ClearControls();

}

else

{

lblResponse.Text = "Record Not updated.";

}

}(Exception ex)

{

lblResponse.Text = ex.Message;

}

}
Ramesh Palanivel8y ago
Please share some screen shot of your source code with error.
Himanshu Tyagi8y ago
doesnt contain the defination for Value?
Ramesh Palanivel8y ago
Hi,

PLease try the below code,

var hiddenvalue=gridData.SelectedRow.Cells[0].Value.toString()