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String sql =String.Format(@"
SELECT a
FROM table1
WHERE a ='{0}'
AND b='{1}'
",para,para1);
String sql =String.Format(@“
SELECT a
FROM table1
WHERE a ='{0}'
AND b='{1}'
",para,para1);
string queryString = "select a from table1 where a = @para";
SqlCommand cmd = new SqlCommand(queryString, conn);
cmd.Parameters.Add("@para", para);
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
adapter.Fill(dt);
this.GridView1.DataSource = dt;
this.GridView1.DataBind();