c#查询数据库帮助

我在这里做一个OCR。在我的系统中，用户输入图像、字符和描述。

如果用户想要输入另一个具有相同字符和描述的图像，用户只需要导入现有的图像，告诉系统字符和描述是相同的，这样用户就不需要再次输入字符和描述。

有人知道怎么做吗?

下面是我的代码:

con = new System.Data.SqlClient.SqlConnection();
            con.ConnectionString = "Data Source=SHEN-PC''SQLEXPRESS;Initial Catalog=CharacterImage;Integrated Security=True";
            con.Open();
        //set variables to the textbox.text
        String ImageLocation = imgLoc.Text;
        String typeName = CharTB.Text;
        String ImportExt = importTB.Text;
        String CharDesc = DescTB.Text;
        String fileName = System.IO.Path.GetFileName(ImageLocation);
        String savePath = @"C:'Users'Shen'Desktop'LenzOCR'LenzOCR'WindowsFormsApplication1'ImageFile'" + fileName;
        inputImageBox.Image = Image.FromFile(ImageLocation);
        inputImageBox.Image.Save(savePath);
        String insertData = "INSERT INTO CharacterImage(ImageName, ImagePath, Character, CharacterDescription) VALUES('"+fileName+"', '"+savePath+"', '"+typeName+"', '"+CharDesc+"')";
        SqlCommand cmd = new SqlCommand(insertData, con);
        cmd.ExecuteNonQuery();
        con.Close();
        MessageBox.Show("Character Inserted", "Insert Success!", MessageBoxButtons.OK, MessageBoxIcon.Information);
        descDisplayTB.Text = typeName + "'r'n'r'n" + CharDesc;
        //set the Textbox to empty and the "Type Character" textboxt to uneditable 
        //and the "Import" button to unclickable after user add the data into the database
        imgLoc.Text = "";
        CharTB.Text = "";
        importTB.Text = "";
        DescTB.Text = "";
        CharTB.ReadOnly = true;
        ImportButton.Enabled = false;
    }
    private void button2_Click(object sender, EventArgs e)
    {
        descDisplayTB.Text = "";
        pictureBox1.Image = null;
    }