Question

Error when saving data to database. DataAdapter.Fill(ds,”Table”) is throwing SqlException saying error while converting data type nvarchar to numeric.

private void btnSave_Click_1(object sender, EventArgs e)
{
    da = new SqlDataAdapter();
    da.SelectCommand = new SqlCommand("select * from Measurement where ID = @ID", con);
    da.SelectCommand.Parameters.AddWithValue("@ID", txtID.Text);
    SqlCommandBuilder cb = new SqlCommandBuilder(da);
    da.Fill(ds, "Measurement"); //(SqlException Unhandled)Error converting data type nvarchar to numeric.

    if (String.IsNullOrEmpty(txtCellNo.Text.Trim()))
    {
        MessageBox.Show("Please enter Cell Number");
    }
    else
    {
        try
        {
            dr = ds.Tables["Measurement"].Rows[0];

            dr["CellNumber"] = txtCellNo.Text.Trim();
            dr["FirstName"] = txtFirstName.Text;
            dr["LastName"] = txtLastName.Text;
            dr["Shirt"] = txtShirt.Text;
            dr["Pant"] = txtPant.Text;
            dr["DueDate"] = txtDueDate.Text;
            dr["Date"] = txtDate.Text;

            cb.GetUpdateCommand();
            da.Update(ds, "Measurement");
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }
}

Answer 1

This line:

da.SelectCommand.Parameters.AddWithValue("@ID",txtID.Text);

txtID.Text is a string that you need to convert to an integer. See Int.TryParse