Additional information: Input string was not in a correct fo

Question

 Hi Every one,

 Iam New Software Developer  i write One Logic code But I got Small and simple Error  where iam doing Wrong Find out Me And Modified my  source code in the Below the My Source Code..

 

public void chkStatus_OnCheckedChanged(object sender, EventArgs e)

{

CheckBox chkStatus = (CheckBox)sender;

GridViewRow row = (GridViewRow)chkStatus.NamingContainer;

string UserName = row.Cells[5].ToString();

bool ApproveStatus = chkStatus.Checked;

string constr = @"Data Source=SERVER;Initial Catalog=MuraliIIT;User ID=sa;Password=rits@1234";

string query = "UPDATENewStudentRegistrationForm SET ApproveStstus = @ApprovedStatus WHERE UserName = @UserName";

SqlConnection con = new SqlConnection(constr);

SqlCommand com = new SqlCommand(query, con);

com.Parameters.Add("@ApproveStatus", SqlDbType.Bit).Value = ApproveStatus;

com.Parameters.Add("@UserName", SqlDbType.Char).Value = Convert.ToInt32(UserName);

con.Open();

com.ExecuteNonQuery();

con.Close();

Thanks &Regards,

subbareddy.