how can show data on radio button checked and data in textbox

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C#

ASP.NET

Hi
I am shailendra singh. Can any one help me.

I want to checked radio button and show data in gridview by function .
My following Function.

public void FillGrid() 
  
 {
     string qry = "";
     if (rbtnstudnm.Checked)
{
qry = "Select StudentId,Name,FathersName,Class,Board,Category from tblStudReg  where Name ='" + txtstudname.Text.Trim() + "' and StudStatus='Active' Order By StudentId";
}
     if 
{
 (rbtnstudnm.Checked) qry = "Select StudentId,Name,FathersName,Class,Board,Category from tblStudReg  where name like '" + txtstudname.Text.Trim().Replace(" ", "%") + "%' and StudStatus='Active' Order By StudentId";
}
     
if (rbtnstudcls.Checked && drpalpha.SelectedValue == "All") 
{
qry = "select StudentId,Name,FathersName,Class,Board,Category from tblStudReg where Board='" + drpboard.SelectedValue.ToString() + "' and Class='" + drpclass.SelectedValue.ToString() + "' and Medium='" + drpmedium.SelectedValue.ToString() + "' and StudStatus='Active'  Order By StudentId";
}
     
if (rbtnstudcls.Checked && drpalpha.SelectedValue != "All")
{ 
qry = "select StudentId,Name,FathersName,Class,Board,Category from tblStudReg where Board='" + drpboard.SelectedValue.ToString() + "' and Class='" + drpclass.SelectedValue.ToString() + "' and Medium='" + drpmedium.SelectedValue.ToString() + "' and StudStatus='Active' and name like'" + drpalpha.SelectedValue.ToString() + "%' Order By StudentId";
}

     da = new SqlDataAdapter(qry, con);
     DataTable dt = new DataTable();
     //Response.Write(qry);
     da.Fill(dt);
     lblcount.Text = "No.Of Student Searched : " + Convert.ToString(dt.Rows.Count);
     GridView1.DataSource = dt;
     GridView1.DataBind();
    }

this my function please help me.

Thanks for advance.