adding data to grid view

here is my function but still i am confuse how to do this form procedure before i done tis simple querry



public static void FillDataInGridView_umrf(string proc_mod,int mrf, DataGridView dg1)
{
string sql_string = ("Data Source=345jk5jh5kjh;Initial Catalog=fgsdfgdfg;User Id=ertertd;Password=dfgdfgdfg;");
SqlConnection conn = new SqlConnection(sql_string);
SqlCommand command = new SqlCommand(proc_mod, conn);
conn.Open();
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("@mrfid", mrf);
SqlDataAdapter a = new SqlDataAdapter(proc_mod, conn);
DataTable t = new DataTable();
a.Fill(t);
dg1.DataSource = t;
}