error of conversion of varchar to numeric?

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SQL-Server

Visual-Studio

(when i am running this code it is giving an error near "if(rdr.Read())" that failed to convert varchar to numeric)
private void Balance_Enquiry_Load(object sender, EventArgs e)
{
//label3.Visible = false;
SqlConnection con = new SqlConnection(@"data source=ABHINAV-PC\ABHI;integrated security=true;initial catalog=ATM;");
con.Open();
SqlCommand cmd = new SqlCommand("select * from transactions where account_no='" + label2.Text + "'", con);
SqlDataReader rdr = cmd.ExecuteReader();
if (rdr.Read())
{
label2.Text = rdr["total"].ToString();
}
rdr.Close();
rdr.Dispose();
con.Close();
}