How To Fill Gridview When I Click On Submit Button

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C#3.5

Hi
I want to show data on gridview. when i click on add button that form data same want display in gridview on same form. Following code is used but it shows null reference is an instance of an object on this row:- DataRow mydr = mydt.NewRow();

protected void btnAddDocs_Click(object sender, EventArgs e)
{
mydt = (DataTable)(ViewState["Emp_docs"]);
string var = EmpDocs();
DataRow mydr = mydt.NewRow();
mydr["Month"] = Drdwmonth.SelectedValue.ToString().Trim();
mydr["Salary_Slip_No"] = txtsalaryslip_no.Text;
mydr["Emp_Name"] = txtName.Text;
mydr["Emp_Code"] = txtemp_code.Text;
mydr["Upload_Date"] = txtcalender.Text;
mydr["Salary_URL"] = var;
mydt.Rows.Add(mydr);
dt.OpenCon();
SqlCommand cmd = new SqlCommand();
cmd.Connection = dt.SqlCon;
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "SP_Upload_Salary_Slip";
try
{

cmd.Parameters.Add("@Emp_Name", SqlDbType.NVarChar).Value = txtName.Text;
cmd.Parameters.Add("@Salary_Slip_No", SqlDbType.NVarChar).Value = txtsalaryslip_no.Text;
cmd.Parameters.Add("@Upload_Date", SqlDbType.DateTime).Value = txtcalender.Text;
cmd.Parameters.Add("@Month", SqlDbType.NVarChar).Value = Drdwmonth.SelectedValue.ToString().Trim();

if (txtemp_code.Text == "")
{
cmd.Parameters.Add("@Emp_Code", SqlDbType.NVarChar).Value = DBNull.Value;
}
else
{
cmd.Parameters.Add("@Emp_Code", SqlDbType.NVarChar).Value = txtemp_code.Text;
}