Problem when Looping checkbox to get values in asp.net c#

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ASP.NET

C#3.5

Hello Coders,

I have a problem in gridview checkbox multiple inserts.
i have a Hidden field traID in design and also i have checkbox.
Once user select checkbox and click on button Req two values to be passed to the another function.

Here is code of Req_Click. where in i able to pass only one record at the time.

When user select a row using checkbox multiple records, values to be sent to function
how can implement this ?
I have InsertRecord function where I send these two values to insert record into the SQL database.

protected void btnReq_Click(object sender, EventArgs e)
{
foreach(GridViewRow dg in gvw_tdetails.Rows)
{
HiddenField hd = dg.Cells[6].FindControl("traID") as HiddenField;
CheckBox chkBox = (CheckBox)dg.FindControl("checkbox");
If (chkBox.Checked && chkBox!=null)
{
string tid = ((Label)dg.Cells[0].FindControl("lblTempID")).Text;
string txid = hd;
InsertRecord(tid,txid);
}
 
}
}