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when run my code I got this error "Parameters were not supplied for function"

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  1.  SqlDataAdapter dam = new SqlDataAdapter("select * from calculate_amt where DistrictName='" + DropDownList1.Text + "' and poste='" + DropDownList2.Text + "'", con);
  2.             DataSet dsm = new DataSet();
  3.             dam.Fill(dsm, "amt");
  4.             DataView dvm = new DataView(dsm.Tables["amt"]);
  5.             txtAmt.Text = dvm[0]["amt"].ToString();
Feb 21 '13 #1
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