ASP.NET Error converting datatype nvarchar to numeric

I am trying to insert product details into my product table to be stored and later on selected from to display

I have already tried

cmd.Parameters.AddWithValue("ProdPrice", Convert.ToInt32(txtProdPrice.Text));

cmd.Parameters.AddWithValue("ProdPrice", decimal.Parse(txtProdPrice.Text));

cmd.Parameters.AddWithValue("prodStock", int.Parse(txtProdStock.Text));

product table

CREATE TABLE [dbo].[Product] (
    [ProdID]    INT             IDENTITY (1, 1) NOT NULL,
    [ProdName]  NVARCHAR (50)   NOT NULL,
    [ProdPrice] DECIMAL (18, 2) NULL,
    [ProdDesc]  NVARCHAR (MAX)  NULL,
    [ImageName] NVARCHAR (255)  NULL,
    [Size]      INT             NULL,
    [ImageData] VARBINARY (MAX) NULL,
    [ProdBrand] NVARCHAR (50)   NULL,
    [ProdStock] INT             NULL,
    PRIMARY KEY CLUSTERED ([ProdID] ASC)

.ASPX.CS Codes

string cs = ConfigurationManager.ConnectionStrings["DataBase"].ConnectionString;
            using (SqlConnection con = new SqlConnection(cs))
            {
                SqlCommand cmd = new SqlCommand("insert into Product values (@ProdName, @ProdDesc, @ProdPrice, @ImageName, @Size, @ImageData, @ProdBrand, @ProdStock);", con);
                cmd.Parameters.AddWithValue("ProdName", txtProdName.Text);
                cmd.Parameters.AddWithValue("ProdDesc", txtProdDesc.Text);
                cmd.Parameters.AddWithValue("ProdPrice", decimal.Parse(txtProdPrice.Text));
                cmd.Parameters.AddWithValue("ImageName", fileName);
                cmd.Parameters.AddWithValue("Size", fileSize);
                cmd.Parameters.AddWithValue("ImageData", bytes);
                cmd.Parameters.AddWithValue("ProdBrand", ddlBrand.SelectedItem.Text);
                cmd.Parameters.AddWithValue("prodStock", int.Parse(txtProdStock.Text));


                con.Open();
                cmd.ExecuteNonQuery();
                con.Close();

                lblImageResult.Visible = true;
                lblImageResult.Text = "Upload Successful";
                lblImageResult.ForeColor = System.Drawing.Color.Green;

All results are still the same, "error converting datatype nvarchar to numeric"